Lock the adbname and adbentry prior to unlocking hash locks

Lock the adbname and adbentry prior to unlocking hash locks

There was a datarace that could expire a freshly created ADB names and
entries between the return from get_attached_{name,entry} and locking it
again.  Lock the ADB name and ADB entry inside the hash table lock, so
they won't get expired until the full initialization has been complete.